JP4079941B2 - Filter medium accommodation unit in water tank outer filtration apparatus and water tank outer filtration apparatus comprising the filter medium accommodation unit - Google Patents

Description

  The present invention relates to a filter medium accommodation unit in an aquarium external filtration device that hangs around a side wall of an aquarium for viewing or rearing and circulates while filtering water (fresh water and seawater) in the aquarium.

In this type of filtration device, a filter for purifying the water sucked up from the inside of the water tank and a water purification tank part for containing the filtering material are formed in the apparatus main body, and the water purification tank part holds activated carbon. use the filter unit is provided, but, recently, with the various filtration materials are developed, those which the arrangement transverse to the water purification tank unit separately filtering material accommodating unit and the filter unit It is getting more.

  As this filter material accommodation unit, what was conventionally constituted by a unit substrate and a cover is devised (for example, refer to patent documents 1).

That is, as shown in FIG. 15, the filter medium accommodation unit is a cover in which one inflow pipe 103 is provided on the side of the upstream side surface of the unit substrate 102 having a large number of outflow small holes 101 formed in the upper part. 104 is detachably mounted, and a plurality of granular filter media M made of a porous cellulose derivative is stored in a filter media storage chamber 105 formed by the cover 104 and the unit substrate 102. The pumped water W is taken into the filter medium accommodating chamber 105 from the one inflow pipe 103 and filtered by the granular filter medium M, and the purified water W is discharged from the outflow small hole 101.
Utility Model Registration No. 3074582 (page 10, FIG. 9)

  However, in the above-described conventional one, the unit substrate 102 and the cover 104 form only one filter medium accommodating chamber 105, and therefore, it is necessary to filter with only one selected type of filter medium. It is difficult to obtain highly purified water W that can be diligently adapted to different types and delicate breeding environments.

  Moreover, since the water W supplied to the water purification tank flows into the filter medium accommodating chamber 105 from one inflow pipe 103 provided in the cover 104, the water W travels around the entire area of the filter medium accommodating chamber 105. There is also a problem that it is difficult to filter, and it flows out of the outflow small hole 101 only by contacting with a part of the filtering material, resulting in poor filterability.

  The present invention has been made in view of the above circumstances, and in an externally mounted filtration apparatus for an aquarium, which is excellent in filterability and can easily obtain high-grade clean water that can be diligently adapted to the species and breeding environment. It is an object to provide a filter medium accommodation unit.

  In order to solve the above-mentioned problem, the invention of claim 1 is located upstream of the filter disposed across the water purification tank section, crosses the water purification tank section, and is detachable. In the filter medium accommodation unit in the water tank outer filter, the filter medium accommodation chamber is constituted by the installed unit board and a cover that is detachably and tightly attached to the upstream side surface of the unit board. One or a plurality of perforated partition plates that divide the filter material storage chamber into a plurality in the vertical direction are detachably disposed in the material storage chamber, and the peripheral wall and bottom wall of the cover corresponding to the lowermost filter material storage chamber The water pumped up from at least one of the water tanks is taken in, and the water that has passed through the uppermost filtration chamber is caused to flow into the region corresponding to the uppermost filtration compartment on the unit substrate. Those related to the filtration material accommodating unit in the aquarium outside hanging type filtration apparatus characterized by the formation of the outflow hole number.

  According to a second aspect of the present invention, there is provided a filter medium accommodation unit in a water tank external filtration device in which a large number of small inflow holes for taking in water supplied to the water purification tank section are formed in the peripheral wall and bottom wall of the cover. It is related to.

  According to a third aspect of the present invention, an inflow pipe for taking in water in the water tank is formed on the side wall of the cover, and the water tank is set so that the opening of the inflow pipe faces the opening of the water supply pipe connected to the pump unit The present invention relates to a filter medium accommodation unit in an external filter apparatus.

  According to a fourth aspect of the present invention, the inflow pipe is formed in the middle portion of the cover in the height direction of the side wall, and the water inflow from the inflow pipe is guided to the lowermost portion of the filter medium accommodation chamber in the cover. The present invention relates to a filter medium accommodation unit in a water tank external filtration device having a path.

  A fifth aspect of the present invention relates to an aquarium external filtration apparatus comprising the filter medium accommodation unit according to any one of the first to fourth aspects.

  According to the filter medium accommodation unit in the external filtration device for an aquarium of the invention of claim 1, the filter medium accommodation chamber formed by the unit substrate and the cover is divided into a plurality in the vertical direction by one or a plurality of porous partition plates. Since the different filter media are accommodated in the plurality of filter media storage chambers, for example, the water supplied to the water purification tank unit is sequentially brought into contact with the different filter media in the flow direction. Thus, it is possible to obtain high-quality clean water suitable for different types of organisms.

  Further, water drawn from the water tank is taken in from at least one of the peripheral wall and the bottom wall of the cover corresponding to the lowermost filter material accommodation compartment, and corresponds to the uppermost filtration compartment on the unit substrate. By forming a large number of outflow holes through which the water that has passed through the uppermost filtration chamber flows out in the region, the inflowing water comes into contact with the filter medium while spreading over almost the entire area of the filtration compartment. Is increased. Furthermore, since the porous partition plate can be removed, the number of the filter medium accommodation chambers can be easily changed.

  According to the filter medium accommodation unit in the external filtration device for an aquarium of the invention of claim 2, a large number of inflow small holes are formed in the peripheral wall and bottom wall of the cover for taking in water supplied to the water purification tank section. Therefore, it is structurally simple and easy to manufacture.

  According to the filter medium accommodating unit in the water tank external filtration device of the invention of claim 3, an inflow pipe for taking in water in the water tank is formed on the side wall of the cover, and the opening of the inflow pipe is a pump part. Therefore, the water in the water tank supplied from the water supply pipe can be reliably taken into the filter medium accommodation unit. In addition, since the labor of connecting the inflow pipe and the water supply pipe can be saved, the entire filtering device can be easily assembled.

  According to the filter medium accommodation unit in the external filtration device for an aquarium of the invention of claim 4, the inflow pipe is formed at the intermediate portion in the side wall height direction of the cover, and the inflow pipe is formed in the cover from the inflow pipe. Since there is a guide path that guides the inflowing water to the lowermost part of the filter medium storage chamber, the water flowing in from the inflow pipe must pass through the lowermost part of the filter medium and reach the upper part of the filter medium, effectively using the filter medium can do.

  According to the water tank external filtration device of the invention of claim 5, since the filter medium accommodation unit according to any of claims 1 to 4 is provided, the same as the invention of each claim An effect is obtained.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an overall perspective view showing an aquarium external filter device to which the filter medium accommodation unit of the first embodiment of the present invention is applied, and FIG. 2 shows the same water tank external filter device with its lid removed. FIG.

  1 and 2, the water tank external filtration device A includes a device main body 1, a lid 2, a pump unit 4, a water absorption pipe unit 5, a filter unit 6, a filter material accommodation unit 7, and the like. .

The apparatus main body 1 is formed in a tank shape from a synthetic resin or the like, and its front end is bent and hung downward to be hooked to the upper end of the side wall Na of the water tank N as shown in FIG. The portion 11 is integrally formed, and the water absorption pipe disposing portion 12 is formed on the right side, while the water W sucked up from the water tank N is purified on the left rear portion as shown in FIG. The water purification tank part 13 for doing is formed. The left upper surface 11 a of the hanging portion 11 is a falling wall surface for discharging the purified water W after purification into the water tank N.

  As shown in FIG. 3, the lower surface of the apparatus main body 1 has an eccentric horizontal adjustment in which the amount of forward protrusion is changed by a turning operation in order to correct the tilted posture in the state of being hung on the water tank N. A knob 110 is provided. In addition, a distribution unit 14 that distributes the clean water W to the left and right and dissipates it in the water tank N over a wide range is provided at the lower end of the falling wall surface 11a.

  A deep bottomed hole portion 15 is formed at the rear portion of the water absorption pipe disposing portion 12, and a lower portion of the bottom wall serves as the pump portion 4.

  As shown in FIG. 4, the pump unit 4 includes a motor 41 and an impeller unit 42 that is driven by the motor 41 and applies a suction force to the water absorption main pipe 51.

  The lid 2 covers the opening of the apparatus main body 1 in a detachable manner.

  The water absorption pipe part 5 includes an inverted L-shaped water absorption main pipe 51 arranged in the water absorption pipe disposition part 12. An upper end portion of a strainer pipe 59 immersed in the water W of the water tank N is connected to the outer end portion of the water absorption main pipe 51. A cylindrical strainer sponge (not shown) is attached to the lower end portion of the strainer pipe 59.

  A water absorption flow rate adjustment unit 52 is provided at the inner end of the water absorption main pipe 51, and a vertical pipe 53 is connected to the downstream side thereof.

  A motor connection pipe 54 surrounding the impeller 42 and the like is connected to the lower end portion of the vertical pipe 53, and a water supply pipe 55 for supplying the absorbed water W to the water purification tank unit 13 is connected to the peripheral wall. ing.

  For example, as shown in FIGS. 6 and 7, the water absorption flow rate adjusting unit 52 includes a cylindrical part 521 that is rotatably fitted in an inner end side opening of the water absorbing main pipe 51 and the cylindrical part 521. And a flow rate adjusting knob 522 that is connected to the tip end of the head and protrudes radially outward.

  A cutout 523 for changing the opening area of the connection portion between the water absorption main pipe 51 and the vertical pipe 53 is formed on the peripheral wall of the cylindrical portion 521, and the cylindrical portion 521 is turned by rotating the flow rate adjusting knob 522. The flow rate from the water absorption main pipe 51 to the vertical pipe 53 is adjusted according to the amount of rotation.

  The water supply pipe 55 is provided with an intake cylinder portion 56, and the lower end of an air introduction pipe 57 made of a flexible material such as a rubber pipe is connected to the intake cylinder portion 56 as shown in FIG. Has been. In addition, as shown in FIG. 5, the structure of generating the negative pressure for intake is employ | adopted for the rib of the inner surface part 55a upstream from the intake cylinder part 56 in the said water supply pipe 55, and a water supply pipe internal shape. The sucked air is supplied into the water purification tank 13 together with the water W.

  An air flow rate adjusting member 58 is connected to the upper end opening of the air introduction pipe 56.

  As shown in FIGS. 8 and 9, the air flow rate adjusting member 58 has a cylindrical knob receiving body 581 connected to the air introduction pipe 56, and is fitted into the upper portion of the knob receiving body 581 so as to be rotatable. Air flow rate adjustment knob 582.

  A vertical groove 581 a is formed in the peripheral wall of the knob receiving body 581, while an opening 582 a is formed in the peripheral wall of the air flow rate adjusting knob 582. The amount of air sucked in is adjusted by the amount of overlap between the vertical groove 581a and the opening 582a when the air flow rate adjusting knob 582 is rotated.

  The septic tank 13 accommodates the filter unit 6 and the filter medium accommodation unit 7 disposed on the upstream side of the filter unit 6.

  As shown in FIG. 12, the filter unit 6 includes a rectangular porous substrate 61 made of synthetic resin inserted between the left and right insertion grooves 131, 131 of the water purification tank unit 13, an upstream side of the porous substrate 61, and The filter members 62 and 63 are mounted on the downstream side surfaces.

  Activated carbon Q is held in the filter members 62 and 63.

  As shown in FIGS. 11 and 12, the filter medium accommodation unit 7 includes a unit substrate 71 inserted into the left and right insertion grooves 132, 132 in the water purification tank 13, and a cover 72. Filter media MA, MB, MC are accommodated in a filter media storage chamber 76 formed between the cover 72 and the cover 72.

  The unit board 71 is formed of a synthetic resin or the like so that its front shape is substantially rectangular, and the upstream side surface 71a is provided with three upper and lower left and right positions so that the cover 72 can be detachably attached. Engagement holes 711... Are formed.

  The upstream side surface 71a is formed with an annular rib 712 that tightly surrounds the periphery of the opening of the cover 72 in the mounted state. A handle portion 713 is formed on the upper portion for pulling up at the time of replacement.

  The cover 72 is formed into a quadrangular container shape with synthetic resin or the like, and has three locking claws that are removably engaged with the engagement holes 711. The piece 721 is integrally formed.

  Further, the inner surface of the side wall 72a of the cover 72 is provided with a plurality of, for example, two-level horizontal beam portions 73A and 73B, which are located on the left and right sides. These two-level left and right horizontal beam portions 73A and 73B are provided. The two perforated partition plates 75A and 75B, each having a small hole 74 formed in the entire region, are detachably inserted and supported.

  By these two porous partition plates 75A and 75B, the inside of the cover 72, that is, the filter medium accommodating chamber 76 is formed into three stages of filter medium accommodating chambers 76A, 76B and 76C in the vertical direction, and these filter medium accommodating chambers 76A. , 76B, 76C contain, for example, different types of filter media MA, MB, MC in order to obtain suitable clean water W for raising animals.

  In addition, a large number of inflow small holes 77 for the water W flowing in from the water absorption pipe 55 are formed in the entire area in the side wall 72a and the bottom wall 72b of the cover 72 corresponding to the lowermost filter medium accommodation compartment 76A. Yes. In addition, this inflow small hole 77 should just be provided in either one of the side wall 72a and the bottom wall 72b.

  Corresponding to the uppermost filter medium accommodation compartment 76 </ b> C, a large number of outflow holes 78 through which the water W that has passed through the filter medium accommodation chamber 70 flows out are formed in the upper part of the unit substrate 71. A similar outflow small hole 78 is formed outside the corresponding area of the cover 72 of the unit substrate 71.

  Next, a procedure for using the filtration device having the above-described configuration will be described.

  First, the filter unit 6 and the filter medium accommodation unit 7 are arranged in the water purification tank 13. On the other hand, an inverted L-shaped water-absorbing main pipe 51 and the like are provided in the water-absorbing pipe disposing portion 12.

  Here, in the filter material accommodation unit 7 in the lowermost (uppermost stream side) filter material accommodation compartment 76A, for example, a filter material MA made of ring-shaped ceramics, and in the subsequent filter material accommodation compartment 76B, filtration made of sponge. Filter material MC made of non-woven fabric is accommodated in the material MB and the filter material accommodation compartment 76C in the uppermost stage (the most downstream side).

  And the filtration apparatus A is set so that the said latching part 11 may be hooked on the side wall upper end of the water tank N. FIG. At this time, the horizontal adjustment knob 110 is turned so that the filtering device A is maintained in a horizontal posture.

Further, the length is adjusted so that the lower end portion of the strainer pipe 52 is located sufficiently below the water level of the water tank N. Incidentally, the lower end of the strainer pipe 5 9, previously fitted with a strainer sponge. Moreover, priming water is put into the water purification tank 13 and the motor 41 housing portion to start the motor 41.

  When the motor 41 is started, as shown in FIG. 10, the impeller unit 42 rotates, a suction force acts in the water absorption main pipe 51, and water absorption of the water W in the water tank N is started. Then, the water W is supplied from the water supply pipe 55 into the water purification tank 13 through the suction main pipe 51 and the vertical pipe 53 while dust is removed by the strainer pipe 52.

  The water absorption flow at this time is performed by rotating the flow adjustment knob 522 in the water absorption flow adjustment unit 52. Further, if air is introduced by rotating the knob 582 in the air flow rate adjusting member 58, the air is supplied into the water purification tank 13 through the water supply pipe 55.

  When the water level of the water W supplied into the water purification tank 13 increases, the water W passes through the inflow small holes 77 of the side wall 72a and the bottom wall 72b of the cover 72 in the filter medium accommodation unit 7 to the lowest stage. Flow into the filter medium containing compartment 76A.

  Since the lowermost filter medium accommodation compartment 76A contains a filter medium MA made of a ring-shaped ceramic, the water W makes contact with the filter medium MA while circulating around the filter medium accommodation compartment 76A. Is purified by the filtering action in the first stage.

  Note that the water W supplied into the water purification tank 13 flows into the lowermost filter medium accommodation compartment 76A from the numerous inflow small holes 77 in the side wall 72a and the bottom wall 72b of the cover 72. Unlike what flows in from the place, the filter medium is spread over a wide area in the filter medium accommodating compartment 76A and comes into contact with the filter medium MA in the entire area to improve the filterability.

  As the water level rises, the water W passes from the lowermost filter medium accommodation compartment 76A through the hole 74 of the lower porous partition plate 75A and enters the middle filter medium accommodation compartment 76B. Further purification is achieved by the filtering action in the second stage by contact.

  The purified water W further passes through the small hole 74 of the upper porous partition plate 75B and flows into the uppermost filter medium accommodation compartment 76C. And it purifies | cleans by the filtration action in the 3rd step by the nonwoven fabric MC accommodated here. Thereafter, it flows down from the outflow small hole 78 in the upper part of the unit substrate 71 to the filter unit 6 side.

  As described above, the filter medium storage chambers 76 in the filter medium storage unit 7 are divided into a plurality of stages to form the filter medium storage compartments 76A, 76B, and 76C, so that a plurality of types of filter mediums MA, MB, and MC are sequentially arranged in the flow direction. Therefore, it is possible to easily obtain a high level of clean water W according to the living thing.

  Moreover, since the porous partition plates 75A and 75B that divide the filter medium accommodation chamber 76 into a plurality of stages can be removed, the number of the filter medium accommodation chambers can be reduced, and clean water different from the above can be obtained.

  The water W that has reached the filter unit 6 is purified by receiving a predetermined filtering action, becomes purified water W, flows down the flow-down wall surface 11a, and is distributed to the left and right through the distribution unit 14 while being in the water tank N. Dissipated inside. By such a filtering operation, the water W is circulated and the cleaning of the water W in the water tank N proceeds.

  FIGS. 13 and 14 show a second embodiment of the filter medium accommodation unit of the present invention, which comprises a unit substrate 81 to be inserted into the left and right insertion grooves 132 and 132 in the water purification tank 13 and a cover 82. The configuration in which the filter media MA, MB, and MC are stored in the filter media storage chamber 86 formed between the unit substrate 81 and the cover 82 is the filter media storage of the first embodiment. This is the same as unit 7.

  The filter medium accommodation unit 8 of the second embodiment is different from the filter medium accommodation unit 7 of the first embodiment in that the opening of the inflow pipe 83 projecting from the side wall of the cover 82 is connected to the pump unit. The water in the water tank is taken into the filter medium accommodation unit 8 facing the opening of the water supply pipe, and all of the taken-in water W is sequentially inserted from the lower part of the lowermost filter medium accommodation compartment 86A in the middle stage. The filter material accommodation chamber 86B and the uppermost filter material accommodation chamber 86C pass through. For this purpose, a partition wall 90 is provided in the cover 82 for guiding the water taken in from the inflow pipe 83 to the lower side of the lowermost filter medium accommodation compartment 86A.

  That is, as shown in FIG. 13, the partition wall 90 is composed of a vertical wall portion 90a facing the side wall having an opening facing the inflow pipe 83, and a ceiling portion 90b continuous from the upper portion of the vertical wall portion to the cover side wall. Yes. The hanging wall 90a is a side wall of the lowermost filter medium accommodation compartment 86A, and is formed in such a manner that it is suspended from the ceiling 90b. The lower end of the hanging wall 90a is a distance from the cover bottom wall. It is set to be located in a state where

  A comb-like bottom-stage filter material accommodation compartment partition plate 85a is provided horizontally so as to be connected to the lower end of the partition wall, and a plurality of stages of porous partition plates 85b and 85c are provided detachably above it. It has been. A large number of horizontally long slits 84 are arranged in parallel in each of the porous partition plates 85b and 85c.

  In the figure, reference numeral 821 denotes a locking claw piece detachably engaged with an engagement hole 811... Of the unit substrate 81 to be described later, and 83A and 83B support the porous partition plates 85b and 85c. It is a horizontal crosspiece.

Said unit substrate 81 is synthesized front shape by a resin is formed in a substantially rectangular, in order to removably attach the front Stories cover 82 of its three engaging holes are located on the top and bottom right 811 ... are formed respectively.

The unit substrate 81 is formed with an annular rib 812 that tightly surrounds the periphery of the opening of the cover 872 in the mounted state. Note that a handle portion 813 is formed on the upper portion for pulling up at the time of replacement.

  A plurality of slit holes 87 are arranged in the height direction outside the rib 812 under the unit substrate 81. The slit hole 87 is for allowing water leaked from a gap other than the water supply pipe 55 to pass directly toward the filter unit 6 so as not to overflow from the purified water tank 13.

  A large number of outflow slit holes 88 through which the water W that has passed through the filter material accommodation chamber 86 flows out are formed in the upper part of the unit substrate 81. In addition, an outflow slit hole 88 for overflow is formed outside the corresponding area of the cover 82 of the unit substrate 81.

  The procedure for using the filter device using the filter medium accommodation unit 8 of the second embodiment will be described below. The operation until the water in the water tank is supplied into the water purification layer 13 is the filter medium of the first embodiment. This is the same as the filtration device using the storage unit 7.

  Thus, when the motor 41 is started after the water purification tank 13 is filled with priming water, the sucked water in the tank N is discharged from the water supply pipe 55 to the inflow pipe 83 of the cover 82 and enters the inside of the unit. Will flow in. Since the partition wall 90 is provided inside the unit, the water W that has flowed into the unit flows into the lowermost filter material accommodation chamber 86A from below, and the first-stage filtration is performed.

  Further, as the water level rises, the water W sequentially flows into the upper filter medium accommodating compartments 86B and 86C, and the second and third stages of filtration are performed. Thereafter, it flows down from the outflow slit 88 at the top of the unit substrate 81 toward the filter unit 61.

  The filtration apparatus using the filter medium accommodation unit 8 of the second embodiment has the same or more effect as the filtration apparatus using the filter medium accommodation unit 8 of the embodiment of the first embodiment.

  In other words, the filter medium storage chamber 86 in the filter medium storage unit 8 is divided into a plurality of stages to form the filter medium storage chambers 86A, 86B, 86C, so that a plurality of types of filter media MA, MB, MC are sequentially stored in the flow direction. This makes it possible to easily obtain a high level of clean water W according to the living organism. Moreover, since the water W flowing into the unit flows into the lowermost filter medium accommodating compartment 86A from below, the water W comes into contact with the entire area of the filter medium MA in the lower filter medium accommodating compartment 86A and is filtered. Is increased.

  Moreover, since the porous partition plates 85A and 85B that divide the filter medium accommodation chamber 86 into a plurality of stages are removable, the number of the filter medium accommodation compartments can be reduced, and clean water different from the above can be obtained.

  The water W that has reached the filter unit 61 is purified by receiving a predetermined filtering action, becomes purified water W, flows down the falling wall surface 11a, and is distributed to the left and right via the distributing unit 14 while being in the water tank N. Dissipated inside. By such a filtering operation, the water W is circulated and the cleaning of the water W in the water tank N proceeds.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view showing an aquarium external filtration device to which a filter medium accommodation unit according to a first embodiment of the present invention is applied. It is a top view which similarly removes the cover and shows the external filter for water tanks. It is a side view which shows the state which similarly hung the external filter for water tanks on the side wall of the water tank. It is a partially broken side view of a pump part. It is explanatory drawing of the aeration structure in a supply pipe | tube. It is a longitudinal cross-sectional view of a flow volume adjustment part. It is sectional drawing along the YY line of FIG. It is a longitudinal cross-sectional view which shows an air quantity adjustment part. It is sectional drawing along the ZZ line of FIG. It is explanatory drawing of the whole filtration path | route. It is a disassembled perspective view of a filter medium accommodation unit. It is sectional drawing along the XX line of FIG. It is a disassembled perspective view of the filter medium accommodation unit concerning 2nd Embodiment of this invention. It is principal part sectional drawing of the same filter media accommodation unit. It is sectional drawing which shows the conventional filter media accommodation unit.

Explanation of symbols

6 ··············································································································· ······································································································ The bottom wall of the cover 75A, 75B ··· porous partition plate 76 ······· Filtering material accommodation chamber 76A, 76B ··· Filtering material accommodation compartment 77 ············ Small hole 78 ············ Outflow small hole MA, MB, MC ...

Claims (5)

Located on the upstream side of the filter disposed across the water purification tank section, the unit board that is installed so as to be detachable across the water purification tank section, and the upstream side surface of this unit board can be attached and detached. In the filter medium accommodation unit in the water tank external filtration device in which the filter medium accommodation chamber is constituted by a cover that is tightly mounted as possible,
In the filter medium containing chamber, one or more porous partition plates that divide the filter medium containing chamber into a plurality in the vertical direction are detachably disposed,
The water pumped up from the water tank is taken in from at least one of the peripheral wall and the bottom wall of the cover corresponding to the lowermost filter medium accommodation compartment,
In the external filtration device for an aquarium, a large number of outflow holes for allowing the water that has passed through the uppermost filtration chamber to flow out are formed in an area corresponding to the uppermost filtration compartment on the unit substrate. Filter media storage unit. The filtering material accommodation unit in the external filtration apparatus for water tanks according to claim 1, wherein a large number of inflow small holes for taking in water supplied to the water purification tank section are formed in the peripheral wall and bottom wall of the cover. The inflow pipe which takes in the water pumped up from the water tank is formed in the side wall of the cover, and the opening of the inflow pipe is set to face the opening of the water supply pipe connected to the pump section. Filter medium accommodation unit in the external filtration device for water tanks. The inflow pipe is formed in an intermediate part in the side wall height direction of the cover, and a guide path for guiding water flowing in from the inflow pipe to the lowermost part of the filter medium accommodation chamber is provided in the cover. The filter medium accommodation unit in the outside-type filtration apparatus for water tanks of description. An overhanging filter device for an aquarium, comprising the filter medium accommodation unit according to any one of claims 1 to 4.

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